Both tweets have merit, but let's address Hunter's (since it's aimed at folks like me).

Yes, this will be a huge return for the Series A investors and a decent one for the Series B investors (using $21 as baseline). But beyond the numbers of Series C shares is that many LPs in Series A and B funds have been sitting on inflated paper valuations for more than four years (since general protocol is to mark to the most recent primary round). And those valuations have potentially impacted allocations, not to mention expectations. Moreover, many employees have had inflated expectations of their own (no matter what 409a valuation is tied to their shares).